The root cause of the bug may have been present for a long time. It increased in probability a bit after 2.1.4 (when zfs_dmu_offset_next_sync=1 became the defa

The root cause of the bug may have been present for a long time. It increased in probability a bit after 2.1.4 (when zfs_dmu_offset_next_sync=1 became the default), and even more after 2.2.0 (with block cloning) Quick workaround: echo 0 > /sys/module/zfs/parameters/zfs_dmu_offset_next_sync